Check valve



Nov. 1, 1927;.

D. A. LOCKWOOD CHECK VALVE Filed July 14, 192s n 0 r Z 5 dj MHS/@ Javi JJ \\\\\M\ 9 mur 6 @1 i1 J p 3 J gw. op /0 2 3 0 3 A n 7 5 0 7 U y y, J J 1 l l I A WWW ATTORNEY MTNESSyJ/W Patented Nov.` 1, 1927.

.einen Y,

U D y. E i P T i .i l

nunLnY" n; toenemen,

i i CHECK appncangaiaied muy i4,

` providey a double check valve of thisjtype which is, nevertheless, provided with only a single expansion rubberpand which will consequently be as easy to pull kas the ordinary variety in case occasion arises. p y

An additional object is to provide a device of this character which will be only slightly longer than the ordinary type and which embodies only a few additional parts, the structure being therefore simple and inexpensive to make, easy to assemble or clisassemble, in addition to being positive in v action, eticientand durable in service, and a general improvement in the art.

llVith the above and other objects and advantages in view, the invention consists in the details of construction, and the arrangement and combination of elements to be hereinafter more fully described and claimed, and illustrated in the accompanying drawings, in which:w

Figure 1 is a side elevation of the complete device. 1 x Figure 2 is a central vertical or longitudinal section therethrough, and y Figure 3 is a detail cross section taken on the line 3 3 of Figure 1. 1 l Y Referring more particularly to the drawings, the letter A designates a tubular well casing within which is located the double check valve which constitutes the subject matter of the invention and vis of thestanding type. This valve structure comprises a shell-like body member 10 which has one end formed witha threadedbore 11 vand an exterior tapered surface. 12. Screwed into the bore 1l is a sleeve member 13 terminating' at its upper endin a valve seat 14C and providedy at its lower end with an Out-standing iiange 15 and a notch 16 for engagement therein of a Spannerwrench or the like for Y v p preferred embodiment of the invention, it `should be understood that I reserve the right effecting the necessary turning movement during assembling or disassembling.- Engaged upon the tapered'portion l2 at` the creatina, NEBRASKA;

'VALVE i ieee, vsie-inni no. iaafisa lower-endofthe `body member is an expan-4 sible packing gasket 17 to make a tight fit, this gasket being engaged by a washer 18, in turn engaged bythe outstanding iiange 15 at the lower end of the sleeve member 13 so that when the sleeve member' is screwed firmly into place, thegasket 17 will be forced outwardly into close frictional engagement with the wall of the tubey A.

Mounted uponthe member 13 is a lower check valve 19 which includes a 'stem 20 and a nut like head member 21 thereon'com pressingly engaging a gasket or washer 22 `which coacts lwith the seat 14.

Screwed into the upper end of the body member or shell 10 isthe upper coupling" member 23 provided with a bore 24 and a valve seat 25 which cooperates with the upper check valve 26 which may be formed with a stem 27 and ahead 28 threadedly secured thereto and compressingly engaging against a washer or packing member 29 which coacts with the seat 25. *y

In turn screwed upon the externally threaded upper end ofthe coupling member 23 is a cage 30 terminating in a `threaded reduced extension 31 with` which connects any suitable piping, not shown.

Iny the operation, itwill of course be apparent that the device is placed down inside ofthe well tubing in the same manner. Each check valve acts in exactly the same manner vas other standing valves as an ordinary as the ordinary variety as repairs will be l needed less often; Furthermore even if thev upper valve should become worn, as it isy bound to in the course of time, it is apparent that there is Still a good deal of the load relieved from the lower valve so that leakage is less likely to happen. It is really believed thatthe construction, operation and advan- ,y

tages will be readily vapparent to one skilled in the art without further explanation.

1While I have shown and described i the to make such changes inthe form, construci depart from the spirit of the invention 01 the scope of the subjoined claim.

Having thusV described the invention, I 5 claim:-

In a cheek valve structure of the character described, an intermediate body member provided at its lower end With a threaded bore and a tapered exterior, an expansion gasket engaged upon said tapered exterior, a sleeve member screwed into said bore, an outstanding lange formed on the lower end of said sleeve, a Washer between said flange and gasket and eompressingly engaging the latter, a valve seat formed on the upper end of said sleeve, a coupling member screwed into the upper end of the bod)7 and formed at its upper end with a valve seat, a cage screwed upon the upper end of the coupling member, and a cheek valve cooperating with each seat, eaeh check valve comprising a downwardly extending stem, a head threaded thereon, and a eompressible Washer between the heads and stems.

In testimony whereof I aflix mv signature. DUDLEY A. LOCKW OOD. 

